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test drive

Test Drive

It’s time for the demo of the new version of the interface. When the guys
from Head-Ex arrive, you fire up the new program in IDLE:

I don‛t understand... is
this delivery being sent
to all of the depots? Why
are they all selected?

There’s clearly something wrong with the prototype. There is only
supposed to be one radio button selected at any one time, and yet the
program shows all of the radio buttons selected together.

What happened? You need to look in a little more
detail at how radio buttons actually work.

274 Chapter 8